Stock-based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value (in dollars per share)	$ 5.86	$ 2.29	$ 3.26
Exercise of stock options	$ 1.5	$ 0.8
Exercised (in shares)	109,578,000
Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award, expiration period (in years)	10 years
Unrecognized compensation cost related to unvested stock options	$ 3.0	1.7
Requisite service period (in years)	1 year 10 months 24 days
Exercise of stock options		$ 0.4
Exercised (in shares)			0
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value (in dollars per share)	$ 20.12	$ 7.31	$ 11.50
Requisite service period (in years)	1 year 9 months 18 days
Intrinsic value of awards vested	$ 5.0	$ 1.6	$ 0.7
Fair value of awards vested	3.2	$ 1.7	$ 1.3
Unrecognized compensation cost	$ 4.5
Livent Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized (in shares)	10,683,837
Livent Plan \| Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award, expiration period (in years)	10 years

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Intrinsic value of vested award under share-based payment arrangement. Excludes share and unit options.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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